Results 1 to 6 of 6

Math Help - Infinite Geometric series simple question

  1. #1
    Senior Member vaironxxrd's Avatar
    Joined
    Nov 2010
    From
    USA
    Posts
    424
    Thanks
    1
    Awards
    1

    Infinite Geometric series simple question

    Hello guys,

    I'm having problems with entering an answer on my current homework problem. My course is online and it's asking me

    For what values of the common ratio r is it possible to find the sum of an infinite geometric series? (Enter your answer using interval notation.)?

    I tried using (-1,1) because |r| < 1 , but it appears as a wrong answer I'm a wrong here?

    r could be between -1 and 1
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,605
    Thanks
    1574
    Awards
    1

    Re: Infinite Geometric series simple question

    Quote Originally Posted by vaironxxrd View Post

    I'm having problems with entering an answer on my current homework problem. My course is online and it's asking me

    For what values of the common ratio r is it possible to find the sum of an infinite geometric series? (Enter your answer using interval notation.)?
    I tried using (-1,1) because |r| < 1 , but it appears as a wrong answer, I'm a wrong here?
    r could be between -1 and 1

    What is the series or question?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member vaironxxrd's Avatar
    Joined
    Nov 2010
    From
    USA
    Posts
    424
    Thanks
    1
    Awards
    1

    Re: Infinite Geometric series simple question

    Quote Originally Posted by Plato View Post
    What is the series or question?
    That was the question: For what values of the common ratio r is it possible to find the sum of an infinite geometric series? (Enter your answer using interval notation.)

    But I found out the answer was: (-1,0)U(0,1)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,404
    Thanks
    1293

    Re: Infinite Geometric series simple question

    Surely the series a + 0 + 0 + 0 + 0 + ... is convergent (to a), and this is a geometric series with r = 0... So the answer SHOULD be (-1, 1).
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,605
    Thanks
    1574
    Awards
    1

    Re: Infinite Geometric series simple question

    Quote Originally Posted by Prove It View Post
    Surely the series a + 0 + 0 + 0 + 0 + ... is convergent (to a), and this is a geometric series with r = 0... So the answer SHOULD be (-1, 1).
    That is exactly right. But realize that this is an online quiz-program.
    As such, there is no accounting for the quirks.
    Only the programmer knows why he/she thinks that answer is correct even though it is not.

    Online courses appear to be the future of education.

    If that is correct, we are doomed. In most cases, programmers are not good instructors.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Apr 2013
    From
    Faisalabad
    Posts
    5

    Re: Infinite Geometric series simple question

    Thanks for taking the time to discuss this, beautiful girlsI feel strongly about it and love learning more on this topic. FREE FUNNY VIDEOS If possible, as you gain expertise, would you mind updating your blog with more information? It is extremely helpful for me.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Infinite Geometric Series
    Posted in the Pre-Calculus Forum
    Replies: 12
    Last Post: May 10th 2010, 05:17 AM
  2. Infinite & Geometric Series
    Posted in the Calculus Forum
    Replies: 4
    Last Post: November 17th 2009, 09:18 PM
  3. Infinite Geometric Series type question
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: November 3rd 2009, 02:27 PM
  4. Infinite Geometric Series
    Posted in the Calculus Forum
    Replies: 1
    Last Post: February 4th 2009, 03:24 PM
  5. Geometric infinite series
    Posted in the Calculus Forum
    Replies: 3
    Last Post: October 15th 2006, 07:17 PM

Search Tags


/mathhelpforum @mathhelpforum